You may find users may have a coloured username. This is because they are part of a group. There are currently 5 groups in which a person can be a member of.

These are the 5 groups -

AdministratorSenior ModeratorJunior ModeratorRegularNewbie

Administrator - The over all manager of the forum.Senior Moderator - Helps the Admin run the forum in the background.Junior Moderator - Usually moderates a specific section of the forum.Regular - This is achieved by having 50 posts in the forumNewbie - Everyone is assigned this group upon registration.